[ISSUE #4891] <Add a locking mechanism to solve the problem of repeatedly inserting swagger apidoc&modify the swagger example.>

[lianjunwei]

detais see: #4891

Make sure that:

• You have read the contribution guidelines.
• You submit test cases (unit or integration tests) that back your changes.
• Your local test passed ./mvnw clean install -Dmaven.javadoc.skip=true.

[codecov-commenter]

Codecov Report

Merging #4892 (4f4c806) into master (43e22ed) will decrease coverage by 0.06%.
The diff coverage is 16.94%.

@@             Coverage Diff              @@
##             master    #4892      +/-   ##
============================================
- Coverage     64.23%   64.17%   -0.06%     
- Complexity     8233     8235       +2     
============================================
  Files          1167     1167              
  Lines         34338    34379      +41     
  Branches       3084     3084              
============================================
+ Hits          22057    22063       +6     
- Misses        10522    10556      +34     
- Partials       1759     1760       +1     

Impacted Files	Coverage Δ
...va/org/apache/shenyu/admin/model/entity/TagDO.java	67.05% <0.00%> (-2.46%)	⬇️
...ervice/manager/impl/RegisterApiDocServiceImpl.java	4.76% <0.00%> (+0.11%)	⬆️
...ervice/manager/impl/PullSwaggerDocServiceImpl.java	9.67% <2.63%> (-5.03%)	⬇️
...n/java/org/apache/shenyu/admin/model/vo/TagVO.java	80.95% <33.33%> (-3.67%)	⬇️
.../service/manager/impl/LoadServiceDocEntryImpl.java	69.00% <50.00%> (ø)
...ache/shenyu/admin/service/impl/TagServiceImpl.java	61.38% <60.00%> (-0.98%)	⬇️

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